This thread form is used for airplane propeller hubs.

A. knuckle thread
B. buttress thread
C. square thread
D. worm thread


Answer: B

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An ice dam protection membrane is required in the eave region of a steep roof with an overhanging eave. Which membrane is commonly used for it and how wide must it be?

What will be an ideal response?

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How often should mature horse hoofs be trimmed?

What will be an ideal response?

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Answer the following statement(s) true (T) or false (F)

1. Although the light-emitting diode (LED) can be found in nearly every electronic circuit, it is not easy to spot unless you’ve had some training in electronics. 2. In a seven-segment LED display, which is used in calculators, automobile instrument panels, and countless other applications, each segment is an LED. 3. In a common-anode seven-segment LED display, each LED must have its own current-limiting resistor to prevent the LED from burning out. 4. A Zener diode might look like a PN junction diode, but it behaves drastically different in a circuit. 5. If a varying reverse bias is applied to a varactor diode, the capacitance will stay the same.

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Groove welds should be made with a gradual transition to the base metal at each _____

a. weld root b. throat c. toe d. root opening

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